Good effort and makes sense to use Vivaldi's native ability to change the color behind tabs/on address bar in more than one way.

But yet, the effect isn't really that dramatic – after all it's just the color of one bar that changes. What I would like to see is a dark theme that changes the foreground text/icon colors in sync with chroma/webpages – this would mimic the way it works on a keyboard and a mouse. And as far as I know one member made a custom modification to the browser, which uses the accent color on tab bar, address bar and panel container at the same time – which is a more immersive experience. Gonna look for that mod now ^^

Could it be added even when the theme doesn't change ?
I don't like to have the theme of the whole browser to change at each tab, to avoid being blinded. But having the hue lamps change around me is not blinding, since I don't look at them directly.

Having the possibility to changes the lamps (or razor chroma, to stay on topic), without changing the theme would be nice !

Awesome! I should check out the Razer Chroma stuff. I have enabled Hue support in Vivaldi and issued a feature request some time ago, that I think private tabs (tabs in private windows) should not be followed by Hue. Wondering whether Vivaldi's Chroma integration follows private tabs? In any case, keep up the excellent work!

I own a Razer Black Widow Chroma Keyboard - in the Synapse software there are activated "Chroma apps" and Vivaldi is correct shown as a Chroma app in the list.
In Vivaldi I changed all themes - with accent colors enabled, deactivated and and and - restarte PC (Windows 10) several times.
Nothing happens ....